Ball lock punch retainer

Details Ball lock punch retainer Ball lock punch retainer

1990-04-10

1991-08-13

Jones, David

Metal deforming

Tool and/or tool holder

Having unitary tool-face

72462, 83698, 279 30, 279 76, 279 79, B21D 3704, B26D 726

Patent

active

050385992

ABSTRACT:
An improved punch retainer is disclosed in which a backing plate extends over a relatively large surface area to dissipate force from a punch. A punch retainer body and the backing plate are permanently connected to each other and include passages which are finally ground after the two have been permanently connected. With this arrangement, it is ensured that passages within the backing plate and retainer body are all properly aligned during formation of the punch retainer. Since the backing plate dissipates force over a relatively large surface area, the punch retainer may be used in heavier applications than prior art punch retainers. A spring passage is closed off by a seal received in the backing plate, allowing the use of standard springs.

REFERENCES:
patent: 2089166 (1937-08-01), Reichhardt
patent: 2105391 (1938-01-01), Almdale
patent: 2160676 (1939-05-01), Richard
patent: 2166559 (1939-07-01), Richard
patent: 2348380 (1944-05-01), Graham
patent: 2580930 (1952-01-01), Kost
patent: 3126776 (1964-03-01), Whistler, Sr. et al.
patent: 3563124 (1971-02-01), Gargrave
patent: 3589226 (1971-05-01), Shadowens, Jr.
patent: 4558620 (1985-12-01), Wallis
"Techniques of Pressworking, Sheet Metal" Donald Eary and Edward Reed, 1974, pp. 332-334.

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